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[求助]
自相關(guān)函數(shù)為什么最終會(huì)接近于0
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| 一般的自相關(guān)函數(shù)有類似的表達(dá)式:A(t)=/.其中,B(t)為t時(shí)刻的物理量,如速度、均方末端距、偶極矩等等,有的是矢量,有的是標(biāo)量。<>為系綜平均。當(dāng)t很小的時(shí)候,A(t)接近于1,這個(gè)很好理解。但為什么當(dāng)t很大的時(shí)候,A(t)接近于0?請(qǐng)大家?guī)蛶兔,謝謝! |
專家顧問(wèn) (正式寫手)
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專家經(jīng)驗(yàn): +49 |
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Not always zero. It depends on the ensemble average . At t=infinity, = ^2, so if is not equal to zero, then A(t) won't go to zero at infinite time. For velocity-velocity auto TCF or dipole-dipole TCF in uniform liquid, it should decay to zero since =0. However, at some interfaces or in confinement, the dipole-dipole TCF might not decay to zero since molecule's orientations are not uniformly distributed. |
木蟲 (著名寫手)

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